mirror of
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119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package datastore
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import (
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"fmt"
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gax "github.com/googleapis/gax-go"
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"cloud.google.com/go/internal"
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"cloud.google.com/go/internal/version"
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"golang.org/x/net/context"
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pb "google.golang.org/genproto/googleapis/datastore/v1"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/status"
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)
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// datastoreClient is a wrapper for the pb.DatastoreClient that includes gRPC
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// metadata to be sent in each request for server-side traffic management.
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type datastoreClient struct {
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// Embed so we still implement the DatastoreClient interface,
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// if the interface adds more methods.
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pb.DatastoreClient
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c pb.DatastoreClient
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md metadata.MD
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}
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func newDatastoreClient(conn *grpc.ClientConn, projectID string) pb.DatastoreClient {
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return &datastoreClient{
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c: pb.NewDatastoreClient(conn),
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md: metadata.Pairs(
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resourcePrefixHeader, "projects/"+projectID,
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"x-goog-api-client", fmt.Sprintf("gl-go/%s gccl/%s grpc/", version.Go(), version.Repo)),
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}
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}
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func (dc *datastoreClient) Lookup(ctx context.Context, in *pb.LookupRequest, opts ...grpc.CallOption) (res *pb.LookupResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.Lookup(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) RunQuery(ctx context.Context, in *pb.RunQueryRequest, opts ...grpc.CallOption) (res *pb.RunQueryResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.RunQuery(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) BeginTransaction(ctx context.Context, in *pb.BeginTransactionRequest, opts ...grpc.CallOption) (res *pb.BeginTransactionResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.BeginTransaction(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) Commit(ctx context.Context, in *pb.CommitRequest, opts ...grpc.CallOption) (res *pb.CommitResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.Commit(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) Rollback(ctx context.Context, in *pb.RollbackRequest, opts ...grpc.CallOption) (res *pb.RollbackResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.Rollback(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) AllocateIds(ctx context.Context, in *pb.AllocateIdsRequest, opts ...grpc.CallOption) (res *pb.AllocateIdsResponse, err error) {
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err = dc.invoke(ctx, func(ctx context.Context) error {
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res, err = dc.c.AllocateIds(ctx, in, opts...)
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return err
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})
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return res, err
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}
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func (dc *datastoreClient) invoke(ctx context.Context, f func(ctx context.Context) error) error {
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ctx = metadata.NewOutgoingContext(ctx, dc.md)
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return internal.Retry(ctx, gax.Backoff{}, func() (stop bool, err error) {
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err = f(ctx)
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return !shouldRetry(err), err
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})
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}
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func shouldRetry(err error) bool {
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if err == nil {
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return false
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}
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s, ok := status.FromError(err)
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if !ok {
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return false
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}
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// See https://cloud.google.com/datastore/docs/concepts/errors.
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return s.Code() == codes.Unavailable || s.Code() == codes.DeadlineExceeded
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}
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